CN116133175A - Heating film power design method, heating film, lithium ion battery, equipment and medium - Google Patents

Heating film power design method, heating film, lithium ion battery, equipment and medium Download PDF

Info

Publication number
CN116133175A
CN116133175A CN202310214009.1A CN202310214009A CN116133175A CN 116133175 A CN116133175 A CN 116133175A CN 202310214009 A CN202310214009 A CN 202310214009A CN 116133175 A CN116133175 A CN 116133175A
Authority
CN
China
Prior art keywords
heating film
power
section
temperature
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310214009.1A
Other languages
Chinese (zh)
Inventor
赵恒喜
卢卿
刘振雨
党奎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eve Energy Co Ltd
Original Assignee
Eve Energy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eve Energy Co Ltd filed Critical Eve Energy Co Ltd
Priority to CN202310214009.1A priority Critical patent/CN116133175A/en
Publication of CN116133175A publication Critical patent/CN116133175A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • H01M10/6572—Peltier elements or thermoelectric devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Electromagnetism (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a heating film power design method, a heating film, a lithium ion battery, equipment and a medium. The method comprises the following steps: the method comprises the steps of acquiring the current ambient temperature acquired by a temperature sensor, setting the power required by each section along the length direction of a heating film from the current ambient temperature to a reference temperature, wherein the power of each section is positively correlated with the distance between the section and the center point of the heating film, and combining the characteristics that the heat dissipation condition of the middle position of a battery cell is worst and gradually becomes good towards two sides by positively correlating the power of each section along the length direction of the heating film with the distance between the section and the center point of the heating film, so that the problem that the temperature of the battery cell is uneven due to different heat dissipation conditions of each position of the battery cell can be solved, the temperature uniformity of the battery cell is improved, and the service life of the battery is prolonged.

Description

Heating film power design method, heating film, lithium ion battery, equipment and medium
Technical Field
The invention relates to a heating technology, in particular to a heating film power design method, a heating film, a lithium ion battery, equipment and a medium.
Background
In a low-temperature environment, as the diffusion of lithium ions in the lithium ion battery becomes slow, the ionic conductivity in the electrolyte decreases, the internal contact resistance increases, the various chemical reaction rates become slow, and the like, which results in rapid attenuation of the charge-discharge capacity and the usable capacity of the battery. Particularly, lithium precipitation occurs in a low-temperature environment, and lithium dendrites grow to a certain extent to puncture the diaphragm, so that safety accidents occur. To avoid these accidents, heating films are beginning to be widely used in power cell systems. The heating film is used for heating the battery cell of the lithium ion battery, so that the battery cell works at a normal temperature (for example, 20-30 ℃).
Most of the existing heating films adopt an electric heating mode, and the heat dissipation conditions of all positions of the battery core are different, so that the phenomenon of uneven temperature of the battery core, namely poor temperature uniformity, can be caused, and the service life of the battery is influenced.
Disclosure of Invention
The invention provides a heating film power design method, a heating film, a lithium ion battery, equipment and a medium, which are used for solving the problem that the temperature of a battery core is uneven due to different heat dissipation conditions of each position of the battery core, and improving the temperature uniformity of the battery core, so that the service life of the battery is prolonged.
In a first aspect, the present invention provides a heating film power design method, including:
acquiring the current ambient temperature acquired by a temperature sensor;
the power required for each section to rise from the current ambient temperature to the reference temperature along the length of the heating film is set, wherein the power of the section is positively correlated with the distance of the section from the center point of the heating film.
Optionally, setting the power required to raise each section from the current ambient temperature to the reference temperature along the length of the heating film includes:
calculating estimated heat required by each section along the length direction of the heating film from the current ambient temperature to the reference temperature in a simulation mode, wherein the estimated heat required by the sections is positively correlated with the distance between the sections and the center point of the heating film;
calculating the quotient of the estimated heat and the heating time required by each section to obtain the estimated power required by each section from the current ambient temperature to the reference temperature;
and correcting the estimated power to obtain the power required by each section along the length direction of the heating film from the current ambient temperature to the reference temperature.
Optionally, correcting the estimated power to obtain power required for each section along the length direction of the heating film to rise from the current ambient temperature to the reference temperature, including:
calculating theoretical total power required by heating the battery module from the current ambient temperature to a reference temperature by adopting a plurality of heating films;
calculating the quotient of the theoretical total power and the number of the heating films to obtain the theoretical power of each heating film;
calculating estimated total power of the heating film based on the estimated power required by each section from the current ambient temperature to the reference temperature;
calculating the quotient of the theoretical power and the estimated total power for each heating film to obtain a correction coefficient;
and calculating the product of the correction coefficient and the estimated power required by each section from the current ambient temperature to the reference temperature to obtain the power required by each section from the current ambient temperature to the reference temperature along the length direction of the heating film.
Optionally, the theoretical total power required for heating the battery module from the current ambient temperature to the reference temperature using a plurality of heating films is calculated using the following formula:
Figure BDA0004114248720000031
wherein P is the number of heating films used for driving the battery moduleThe theoretical total power required by the current ambient temperature to be heated to the reference temperature is a redundancy coefficient, C p The specific heat capacity of the battery cell, m is the total mass of the battery module, delta T is the temperature variation of the battery module, and T is the heating duration.
Optionally, calculating the estimated total power of the heating film based on the estimated power required for each section to rise from the current ambient temperature to the reference temperature includes:
establishing an objective function of the estimated power and the distance of the section from the center point of the heating film based on the estimated power required by each section from the current ambient temperature to the reference temperature;
and calculating the integral of the objective function on the distance to obtain the estimated total power of the heating film.
Optionally, after setting the power required for each section along the length of the heating film to rise from the current ambient temperature to the reference temperature, the method further includes:
acquiring the actual temperature of each section along the length direction of the heating film, which is acquired by a temperature sensor, in the heating process;
the power of each section along the length of the heating film is adjusted based on the actual temperature and the expected temperature.
In a second aspect, the present invention also provides a heating film power design apparatus, including:
the temperature acquisition module is used for acquiring the current ambient temperature acquired by the temperature sensor;
and the power setting module is used for setting the power required by each section in the length direction of the heating film from the current ambient temperature to the reference temperature, wherein the power of the section is positively correlated with the distance of the section from the center point of the heating film.
In a third aspect, the invention also provides a heating film, wherein the power of each section along the length direction of the heating film is positively correlated with the distance between the section and the center point of the heating film.
In a fourth aspect, the present invention also provides a lithium ion battery, which comprises at least one heating film and a plurality of electric cells, wherein the heating film is provided on at least one side surface of the electric cells.
In a fifth aspect, the present invention also provides an electronic device, including:
one or more processors;
a memory for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement a heating film power design method as provided in the first aspect of the present invention.
In a sixth aspect, the present invention also provides a computer readable storage medium having stored therein computer executable instructions which when executed by a processor are for implementing a heating film power design method as provided in the first aspect of the present invention.
The heating film power design method provided by the invention comprises the following steps: the method comprises the steps of acquiring the current ambient temperature acquired by a temperature sensor, setting the power required by each section along the length direction of a heating film from the current ambient temperature to a reference temperature, wherein the power of each section is positively correlated with the distance between the section and the center point of the heating film, and combining the characteristics that the heat dissipation condition of the middle position of a battery cell is worst and gradually becomes good towards two sides by positively correlating the power of each section along the length direction of the heating film with the distance between the section and the center point of the heating film, so that the problem that the temperature of the battery cell is uneven due to different heat dissipation conditions of each position of the battery cell can be solved, the temperature uniformity of the battery cell is improved, and the service life of the battery is prolonged.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of a power design of a heating film according to the prior art;
FIG. 2 is a flow chart of a heating film power design method according to an embodiment of the present invention;
FIG. 3 is a diagram of a heating film power design scheme according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an objective function of estimated power versus distance of a cross section from a center point of a heating film according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of calculating an integral of an objective function with respect to distance;
fig. 6 is a schematic structural diagram of a heating film power design device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a power design scheme diagram of a heating film provided in the prior art, wherein the heating film is divided into a plurality of sections with uniform power along the length direction, and the power at two ends is high and the power at the middle part is low. As shown in fig. 1, the heating film is divided into 5 sections, each section having uniformly distributed power at its respective location. The power of each position in the middle section a is minimum, the power of each position in the section c on both sides is maximum, and the power of each position in the section b between the section a and the section c is between the section a and the section c. Because the heat dissipation conditions of all the positions of the battery cell are different, the heat dissipation conditions of the middle position of the battery cell are worst, and the heat dissipation conditions gradually become good towards two sides. In the prior art, the scheme of uniformly designing the power of each position in each interval can cause the phenomenon that heat is accumulated at the middle position of the interval and the temperatures of the positions are inconsistent, so that the service life of the battery is influenced.
In view of the above problems, the embodiment of the invention provides a heating film power design method, which solves the problem of uneven temperature of a battery core caused by different heat dissipation conditions of each position of the battery core by positively correlating the power of each section along the length direction of the heating film with the distance between the section and the center point of the heating film, thereby prolonging the service life of the battery. Fig. 2 is a flowchart of a heating film power design method provided by an embodiment of the present invention, where the embodiment is applicable to a situation that temperature unevenness occurs in a battery cell due to different heat dissipation conditions at each position of the battery cell, and the method may be performed by a heating film power design apparatus provided by an embodiment of the present invention, where the apparatus may be implemented by software and/or hardware, and is generally configured in an electronic device, and as shown in fig. 2, the heating film power design method may include the following steps:
s101, acquiring the current ambient temperature acquired by a temperature sensor.
In the embodiment of the invention, the temperature sensor is arranged outside the lithium ion battery and can be connected with the battery management system (Battery Management System, BMS), and the temperature sensor uploads the acquired current environmental temperature to the battery management system, so that the processing equipment can acquire the current environmental temperature from the battery management system. In order to intelligently manage and maintain each battery unit, the battery management system prevents the battery from being overcharged and overdischarged, prolongs the service life of the battery and monitors the state of the battery. In other embodiments of the present invention, the processing device may also obtain the current ambient temperature directly from the temperature sensor, and embodiments of the present invention are not limited in this respect.
S102, setting the power required by each section along the length direction of the heating film from the current ambient temperature to the reference temperature, wherein the power of the section is positively related to the distance of the section from the center point of the heating film.
The ideal working temperature of the lithium ion battery is 20-45 ℃, and the charge and discharge capability and the available capacity of the lithium ion battery are rapidly attenuated in a low-temperature environment. Thus, in embodiments of the present invention, the set reference temperature may be any temperature between 20 ℃ and 45 ℃, such as 25 ℃.
Fig. 3 is a diagram of a design scheme of heating film power provided in an embodiment of the present invention, in the embodiment of the present invention, after the current ambient temperature is obtained, the power required by each section along the length direction of the heating film to rise from the current ambient temperature to the reference temperature is set, as shown in fig. 3, the power of the section is positively correlated with the distance between the section and the center point of the heating film, i.e. the smaller the power of the section is, the larger the power of the section is, the more the power is, the worse the heat dissipation condition is combined with the middle position of the battery core, and the characteristic that the heat dissipation condition of each position of the battery core is gradually changed to two sides is solved, so that the temperature non-uniformity of the battery core is improved, and the service life of the battery is prolonged.
For example, a positive temperature coefficient material (Positive Temperature Coefficient, PTC) may be provided at each section of the heating film, for example, heating wires, and by adjusting the heating power of each heating wire, a positive correlation of the power of the section with the distance of the section from the center point of the heating film is achieved. In other embodiments of the present invention, other implementations may be used, and embodiments of the present invention are not limited herein.
The heating film power design method provided by the embodiment of the invention comprises the following steps: the method comprises the steps of acquiring the current ambient temperature acquired by a temperature sensor, setting the power required by each section along the length direction of a heating film from the current ambient temperature to a reference temperature, wherein the power of each section is positively correlated with the distance between the section and the center point of the heating film, and combining the characteristics that the heat dissipation condition of the middle position of a battery cell is worst and gradually becomes good towards two sides by positively correlating the power of each section along the length direction of the heating film with the distance between the section and the center point of the heating film, so that the problem that the temperature of the battery cell is uneven due to different heat dissipation conditions of each position of the battery cell can be solved, the temperature uniformity of the battery cell is improved, and the service life of the battery is prolonged.
In some embodiments of the present invention, the step S102 may include the following sub-steps:
s1021, calculating estimated heat required by each section along the length direction of the heating film from the current ambient temperature to the reference temperature in a simulation mode, wherein the estimated heat required by the sections is positively related to the distance between the sections and the center point of the heating film.
In the embodiment of the invention, the estimated heat required by each section along the length direction of the heating film from the current ambient temperature to the reference temperature is estimated by adopting simulation software, the estimated heat required by the section output by the simulation software is positively correlated with the distance between the section and the central point of the heating film, namely, the smaller the estimated heat required by the section which is closer to the central point of the heating film, the larger the estimated heat required by the section which is farther from the central point of the heating film, and the continuously variable trend is realized.
S1022, calculating the quotient of the estimated heat and the heating time required by each section, and obtaining the estimated power required by each section from the current ambient temperature to the reference temperature.
The simulation software is illustratively set with the heating time required for each section to be heated from the current ambient temperature to the reference temperature. And calculating the quotient of the estimated heat and the heating time required by each section to obtain the estimated power required by each section from the current ambient temperature to the reference temperature.
S1023, correcting the estimated power to obtain the power required by each section along the length direction of the heating film from the current ambient temperature to the reference temperature.
The estimated power required by each section from the current ambient temperature to the reference temperature is a reference value estimated by simulation and is not an accurate value, so that the estimated power needs to be corrected. In the embodiment of the invention, the theoretical power required by the heating film to heat the battery cell from the current ambient temperature to the reference temperature can be calculated, and the estimated power is corrected based on the theoretical power, and the correction process is exemplified as follows:
1. the theoretical total power required for heating the battery module from the current ambient temperature to the reference temperature using a plurality of heating films is calculated.
For example, in the embodiment of the present invention, the theoretical total power required to heat the battery module from the current ambient temperature to the reference temperature using a plurality of heating films is calculated using the following formula:
Figure BDA0004114248720000091
wherein P is the theoretical total power required by heating the battery module from the current ambient temperature to the reference temperature by adopting a plurality of heating films, a is a redundancy coefficient, and C p The specific heat capacity of the battery cell, m is the total mass of the battery module, delta T is the temperature variation of the battery module, and T is the heating duration.
2. The quotient of the theoretical total power and the number of heating films is calculated to obtain the theoretical power of each heating film.
In the embodiment of the invention, a plurality of heating films are arranged in the battery module, and if the power of each heating film is the same, the quotient of the theoretical total power and the number of the heating films is calculated to obtain the theoretical power of each heating film, and the calculation formula is as follows:
p＝P/n
where p is the theoretical power of each heating film and n is the number of heating films.
3. The estimated total power of the heated film is calculated based on the estimated power required for each section to rise from the current ambient temperature to the reference temperature.
Illustratively, the sum of the estimated powers required for all sections to rise from the current ambient temperature to the reference temperature is calculated to obtain the estimated total power of the heated film.
In some embodiments of the invention, an objective function of the estimated power versus the distance of the cross-section from the center point of the heating film is established based on the estimated power required for each cross-section to rise from the current ambient temperature to the reference temperature. For example, fig. 4 is a schematic diagram of an objective function of the estimated power and the distance between the cross section and the center point of the heating film, and as shown in fig. 4, the estimated power required by the cross section is positively related to the distance between the cross section and the center point of the heating film, that is, the smaller the estimated power required by the cross section closer to the center point of the heating film, the larger the estimated power required by the cross section farther from the center point of the heating film, and the continuously changing trend is shown in fig. 4.
After the objective function of the estimated power and the distance between the section and the central point of the heating film is obtained, calculating the integral of the objective function about the distance to obtain the estimated total power of the heating film. Fig. 5 is a schematic diagram of calculating the integral of the objective function with respect to the distance, and as shown in fig. 5, the area is calculated by integrating the hatched portion in fig. 5, so as to obtain the estimated total power p' of the heating film.
4. And calculating the quotient of the theoretical power and the estimated total power for each heating film to obtain a correction coefficient.
In the embodiment of the invention, for each heating film, the quotient of the theoretical power p and the estimated total power p' is calculated to obtain the correction coefficient k. I.e. k=p/p'.
5. And calculating the product of the correction coefficient and the estimated power required by each section from the current ambient temperature to the reference temperature to obtain the power required by each section from the current ambient temperature to the reference temperature along the length direction of the heating film.
Illustratively, the estimated power required for each section to rise from the current ambient temperature to the reference temperature is multiplied by a correction factor to obtain the power required for each section to rise from the current ambient temperature to the reference temperature along the length of the heated film.
According to the embodiment of the invention, based on the theoretical power required by the heating film to heat the battery cell from the current environment temperature to the reference temperature, the estimated power required by each section obtained by simulation to rise from the current environment temperature to the reference temperature is corrected, the accuracy of the output power of the heating film is improved, and the temperature uniformity of the heating film is further improved.
In some embodiments of the present invention, after setting the power required for each section to rise from the current ambient temperature to the reference temperature along the length of the heating film, the power required for each section to rise from the current ambient temperature to the reference temperature may also be adjusted based on actual data.
Illustratively, the actual temperature of each section along the length of the heating film acquired by the temperature sensor is acquired during the heating process, and then the power of each section along the length of the heating film is adjusted based on the actual temperature and the expected temperature. For example, if the actual temperature of the cell at a certain section is lower than the expected temperature, the power at that section is increased, and if the actual temperature of the cell at a certain section is higher than the expected temperature, the power at that section is decreased.
The embodiment of the invention also provides a heating film, wherein the power of each section along the length direction of the heating film is positively correlated with the distance between the section and the center point of the heating film, and as shown in fig. 3, the power of the section is positively correlated with the distance between the section and the center point of the heating film, namely, the smaller the power of the section is, the larger the section is, the continuous variation trend is, and the characteristics that the heat dissipation condition of the middle position of a battery core is worst and the heat dissipation condition of the middle position of the battery core is gradually changed to two sides are combined can solve the problem that the temperature of the battery core is uneven due to different heat dissipation conditions of each position of the battery core, and the temperature uniformity of the battery core is improved, so that the service life of the battery is prolonged.
The embodiment of the invention also provides a lithium ion battery, which comprises at least one heating film and a plurality of electric cores, wherein the heating film is arranged on at least one side surface of each electric core. Illustratively, a heating film is attached to each side of each cell.
The embodiment of the invention also provides a heating film power design device, fig. 6 is a schematic structural diagram of the heating film power design device provided by the embodiment of the invention, and as shown in fig. 6, the heating film power design device includes:
an ambient temperature acquisition module 201, configured to acquire a current ambient temperature acquired by a temperature sensor;
the power setting module 202 is configured to set the power required for each section along the length direction of the heating film to rise from the current ambient temperature to the reference temperature, wherein the power of the section is positively correlated with the distance of the section from the center point of the heating film.
In some embodiments of the invention, the power setting module 202 includes:
the estimated heat quantity calculation operator module is used for calculating the estimated heat quantity required by each section along the length direction of the heating film from the current ambient temperature to the reference temperature in a simulation mode, wherein the estimated heat quantity required by the sections is positively related to the distance between the sections and the center point of the heating film;
the estimated power calculation sub-module is used for calculating the quotient of the estimated heat and the heating time required by each section to obtain the estimated power required by each section from the current environment temperature to the reference temperature;
and the estimated power correction sub-module is used for correcting the estimated power to obtain the power required by each section along the length direction of the heating film from the current ambient temperature to the reference temperature.
In some embodiments of the present invention, the pre-estimated power correction submodule includes:
a theoretical total power calculation unit for calculating theoretical total power required for heating the battery module from the current ambient temperature to a reference temperature by using a plurality of heating films;
a theoretical power calculation unit, configured to calculate a quotient of the theoretical total power and the number of heating films, and obtain a theoretical power of each heating film;
the estimated total power calculation unit is used for calculating the estimated total power of the heating film based on the estimated power required by each section from the current ambient temperature to the reference temperature;
the correction coefficient calculation unit is used for calculating the quotient of the theoretical power and the estimated total power for each heating film to obtain a correction coefficient;
and the correction unit is used for calculating the product of the correction coefficient and the estimated power required by each section from the current ambient temperature to the reference temperature to obtain the power required by each section from the current ambient temperature to the reference temperature along the length direction of the heating film.
In some embodiments of the invention, the theoretical total power required to heat a battery module from the current ambient temperature to a reference temperature using a plurality of heating films is calculated using the following formula:
Figure BDA0004114248720000131
wherein P is the theoretical total power required by heating the battery module from the current ambient temperature to the reference temperature by adopting a plurality of heating films, a is a redundancy coefficient, and C p The specific heat capacity of the battery cell, m is the total mass of the battery module, delta T is the temperature variation of the battery module, and T is the heating duration.
In some embodiments of the present invention, the estimated total power calculation unit includes:
an objective function construction subunit, configured to establish an objective function of the estimated power and a distance between the section and a center point of the heating film based on the estimated power required by each section to rise from the current ambient temperature to the reference temperature;
and the integration subunit is used for calculating the integral of the objective function on the distance to obtain the estimated total power of the heating film.
In some embodiments of the invention, the heating film power design apparatus further comprises:
the actual temperature acquisition module is used for acquiring the actual temperature of each section along the length direction of the heating film, acquired by the temperature sensor, in the heating process after setting the power required by each section along the length direction of the heating film to rise from the current ambient temperature to the reference temperature;
and the power adjustment module is used for adjusting the power of each section along the length direction of the heating film based on the actual temperature and the expected temperature.
The heating film power design device can execute the heating film power design method provided by any embodiment of the application, and has the corresponding functional modules and beneficial effects of executing the heating film power design method.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 7, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as the heating film power design method.
In some embodiments, the heating film power design method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the heating film power design method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the heating film power design method by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user section or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
Embodiments of the present invention also provide a computer program product comprising a computer program which, when executed by a processor, implements a heating film power design method as provided by any of the embodiments of the present application.
Computer program product in the implementation, the computer program code for carrying out operations of the present invention may be written in one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A heating film power design method, comprising:
acquiring the current ambient temperature acquired by a temperature sensor;
the power required for each section to rise from the current ambient temperature to the reference temperature along the length of the heating film is set, wherein the power of the section is positively correlated with the distance of the section from the center point of the heating film.
2. The heating film power design method according to claim 1, wherein setting the power required for each section to rise from the current ambient temperature to the reference temperature along the length direction of the heating film, comprises:
calculating estimated heat required by each section along the length direction of the heating film from the current ambient temperature to the reference temperature in a simulation mode, wherein the estimated heat required by the sections is positively correlated with the distance between the sections and the center point of the heating film;
calculating the quotient of the estimated heat and the heating time required by each section to obtain the estimated power required by each section from the current ambient temperature to the reference temperature;
and correcting the estimated power to obtain the power required by each section along the length direction of the heating film from the current ambient temperature to the reference temperature.
3. The heating film power design method according to claim 2, wherein correcting the estimated power to obtain the power required for each section along the length of the heating film to rise from the current ambient temperature to the reference temperature comprises:
calculating theoretical total power required by heating the battery module from the current ambient temperature to a reference temperature by adopting a plurality of heating films;
calculating the quotient of the theoretical total power and the number of the heating films to obtain the theoretical power of each heating film;
calculating estimated total power of the heating film based on the estimated power required by each section from the current ambient temperature to the reference temperature;
calculating the quotient of the theoretical power and the estimated total power for each heating film to obtain a correction coefficient;
and calculating the product of the correction coefficient and the estimated power required by each section from the current ambient temperature to the reference temperature to obtain the power required by each section from the current ambient temperature to the reference temperature along the length direction of the heating film.
4. The heating film power design method according to claim 3, wherein a theoretical total power required for heating the battery module from the current ambient temperature to the reference temperature using a plurality of heating films is calculated using the following formula:
Figure FDA0004114248700000021
wherein P is the theoretical total power required by heating the battery module from the current ambient temperature to the reference temperature by adopting a plurality of heating films, a is a redundancy coefficient, and C p The specific heat capacity of the battery cell, m is the total mass of the battery module, delta T is the temperature variation of the battery module, and T is the heating duration.
5. A heating film power design method according to claim 3, wherein calculating the estimated total power of the heating film based on the estimated power required for each section to rise from the current ambient temperature to the reference temperature comprises:
establishing an objective function of the estimated power and the distance of the section from the center point of the heating film based on the estimated power required by each section from the current ambient temperature to the reference temperature;
and calculating the integral of the objective function on the distance to obtain the estimated total power of the heating film.
6. The heating film power design method according to any one of claims 1-5, further comprising, after setting the power required for each section to rise from the current ambient temperature to the reference temperature along the length direction of the heating film:
acquiring the actual temperature of each section along the length direction of the heating film, which is acquired by a temperature sensor, in the heating process;
the power of each section along the length of the heating film is adjusted based on the actual temperature and the expected temperature.
7. A heating film, wherein the power of each section along the length of the heating film is positively correlated with the distance of the section from the center point of the heating film.
8. A lithium ion battery comprising at least one heating film according to claim 7 and a plurality of cells, said heating film being disposed on at least one side of said cells.
9. An electronic device, comprising:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, causes the one or more processors to implement the heating film power design method of any one of claims 1-6.
10. A computer-readable storage medium having stored therein computer-executable instructions for implementing the heating film power design method according to any one of claims 1-6 when executed by a processor.
CN202310214009.1A 2023-03-07 2023-03-07 Heating film power design method, heating film, lithium ion battery, equipment and medium Pending CN116133175A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310214009.1A CN116133175A (en) 2023-03-07 2023-03-07 Heating film power design method, heating film, lithium ion battery, equipment and medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310214009.1A CN116133175A (en) 2023-03-07 2023-03-07 Heating film power design method, heating film, lithium ion battery, equipment and medium

Publications (1)

Publication Number Publication Date
CN116133175A true CN116133175A (en) 2023-05-16

Family

ID=86295617

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310214009.1A Pending CN116133175A (en) 2023-03-07 2023-03-07 Heating film power design method, heating film, lithium ion battery, equipment and medium

Country Status (1)

Country Link
CN (1) CN116133175A (en)

Similar Documents

Publication Publication Date Title
CN109586373B (en) Battery charging method and device
US10084333B2 (en) Charging method, power adapter, mobile terminal, and charging system
CN113794254B (en) Thermal management strategy configuration method and device, computer equipment and storage medium
CN114937829A (en) Lithium ion battery thermal management strategy optimization method, device, equipment and medium
CN115372841A (en) Method and device for evaluating thermal runaway risk of lithium ion battery monomer
WO2024140107A1 (en) Capacity attenuation coefficient determination method, device, and storage medium
CN117630716A (en) Method and device for predicting service life of battery in real time
CN114779109A (en) Method and device for determining battery health state, electronic equipment and storage medium
CN116243195A (en) Battery module service life determining method, device, equipment and storage medium
CN112437468A (en) Task unloading algorithm based on time delay and energy consumption weight calculation
CN116133175A (en) Heating film power design method, heating film, lithium ion battery, equipment and medium
CN117526508A (en) Energy management method, device, equipment and storage medium of battery energy storage system
CN115656858A (en) Battery life determining method and device, electronic equipment and storage medium
CN115692922A (en) Battery pack refrigerating system control method, electronic equipment and storage medium
CN113839439B (en) Full-period battery pack balance control method, device and storage medium
CN115128476A (en) Lithium ion battery pre-lithium amount estimation method, device, equipment and storage medium
CN115021536A (en) Voltage control method and device for bridge arm unit model
CN111951123B (en) Method and device for controlling electrical load, computer equipment and storage medium
CN117559010B (en) Power control device and method of energy storage system, storage medium and energy storage system
CN110851943B (en) Modeling method and device for battery charging performance
CN117543116A (en) Data acquisition device and method for thermal runaway of battery pack, electronic equipment and storage medium
CN117411128A (en) Charging control method, device, equipment and storage medium
CN118418809A (en) Method, apparatus, device and computer readable storage medium for charging battery of vehicle
CN117423921A (en) Lithium ion battery charging control method and related equipment thereof
CN118572240A (en) Power battery temperature control method, device, equipment and storage medium

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination